If you google "secret recipes" or whatever, there's a recipe for white castle burgers.
I made them once and they were really good. Hmm on second thought...maybe they don't taste like the real thing... ;^)
Years ago, my mom made some "copycat" White Castle burgers. I seem to recall it involved a jar of veal baby food. Urp!
I do love the real White Castles though. Sometimes you just have to have what you crave. :)